"Radical" libertarians believe that one's actions are not determined by anything prior to a decision, including one's character and values, and one's feelings and desires, in short, one's motives and reasons. Their model of free will is not "reasons responsive."

Libertarians are incompatibilists who believe that determinism and free will can not both be "true." Freedom requires some form of indeterminism. This need only be the first stage in a mental deliberation process. This stage generates the alternative possibilities needed for deliberation and evaluation.

Critics of libertarianism (determinists and compatibilists) are really attacking the radical libertarian view. If an agent's decisions are not connected in any way with character and other personal properties, they rightly claim that the agent can hardly be held responsible for them.

Many determinists and compatibilists now accept the idea that there is real indeterminism in the universe. Conservative libertarians agree with them that if indeterministic chance were the direct direct cause of our actions, that would not be freedom with responsibility.

Even the current chief spokesman for libertarianism, Robert Kane admits that "radical" libertarian accounts of free will are unintelligible. No coherent idea can be provided for the role of indeterminism and chance, he says.

But Kane insists that "something more" is needed beyond simple determination of our thoughts and actions by our desires and feelings, our character and values, and our motives and reasons.

Yet, as Dennett and Mele also admit, a causal indeterminist view of this deliberative kind does not give us everything libertarians have wanted from free will. For Mike does not have complete control over what chance images and other thoughts enter his mind or influence his deliberation. They simply come as they please. Mike does have some control after the chance considerations have occurred.

But then there is no more chance involved. What happens from then on, how he reacts, is determined by desires and beliefs he already has. So it appears that he does not have control in the libertarian sense of what happens after the chance considerations occur as well. Libertarians require more than this for full responsibility and free will. What they would need for free will is for the agent to be able to control which of the chance events occur rather than merely reacting to them in a determined way once they have occurred.

Yet, as Mele points out, while this causal indeterminist view does not give us all the control and responsibility that libertarians have wanted, it does give us many of the things they crave about free will (an open future, a break in the causal order, etc.). And it is clearly a possible view. Perhaps it could be further developed to give us more; or perhaps this is as much as libertarians can hope for.
(A Contemporary Introduction to Free Will, p.64-5)

Two-stage models for free will, especially the latest I-Phi Cogito model that has located the contribution of randomness as noise in information processing, leads us to a new conservative libertarianism that is less "free" perhaps than radical libertarianism, but distinctly more "willful" and more responsible.

Accounts of free will purport to tell us what is required if we are to be free agents, individuals who, at least sometimes when we act, act freely. Libertarian accounts, of course, include a requirement of indeterminism of one sort or another somewhere in the processes leading to free actions. But while proponents of such views take determinism to preclude free will, indeterminism is widely held to be no more hospitable. An undetermined action, it is said would be random or arbitrary. It could not be rational or rationally explicable. The agent would lack control over her behavior. At best, indeterminism in the processes leading to our actions would be superfluous, adding nothing of value even if it did not detract from what we want.

2. Honderich, Ted (2002), How Free Are You?, p.5.

"Maybe it should have been called determinism-where-it-matters. It allows that there is or may be some indeterminism but only at what is called the micro-level of our existence, the level of the small particles of our bodies."

3. Searle, John (2004), Freedom and Neurobiology, p.74-75.

"First we know that our experiences of free action contain both indeterminism and rationality...Second we know that quantum indeterminacy is the only form of indeterminism that is indisputably established as a fact of nature...it follows that quantum mechanics must enter into the explanation of consciousness."